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Study identifies gene tied to motor neuron loss in ALS
Date:1/23/2014

NEW YORK, NY (January 22, 2014) Columbia University Medical Center (CUMC) researchers have identified a gene, called matrix metalloproteinase-9 (MMP-9), that appears to play a major role in motor neuron degeneration in amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease. The findings, made in mice, explain why most but not all motor neurons are affected by the disease and identify a potential therapeutic target for this still-incurable neurodegenerative disease. The study was published today in the online edition of the journal Neuron.

"One of the most striking aspects of ALS is that some motor neuronsspecifically, those that control eye movement and eliminative and sexual functionsremain relatively unimpaired in the disease," said study leader Christopher E. Henderson, PhD, the Gurewitsch and Vidda Foundation Professor of Rehabilitation and Regenerative Medicine, professor of pathology & cell biology and neuroscience (in neurology), and co-director of Columbia's Motor Neuron Center. "We thought that if we could find out why these neurons have a natural resistance to ALS, we might be able to exploit this property and develop new therapeutic options."

To understand why only some motor neurons are vulnerable to ALS, the researchers used DNA microarray profiling to compare the activity of tens of thousands of genes in neurons that resist ALS (oculomotor neurons/eye movement and Onuf's nuclei/continence) with neurons affected by ALS (lumbar 5 spinal neurons/leg movement). The neurons were taken from normal mice.

"We found a number of candidate 'susceptibility' genesgenes that were expressed only in vulnerable motor neurons. One of those genes, MMP-9, was strongly expressed into adulthood. That was significant, as ALS is an adult-onset disease," said co-lead author Krista J. Spiller, a former graduate student in Dr. Henderson's laboratory who is now a postdoctoral fellow at the University of Pennsylvania. T
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Contact: Karin Eskenazi
ket2116@columbia.edu
212-342-0508
Columbia University Medical Center
Source:Eurekalert  

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